Book excerpt: When Stephen Cowans is sentenced to a long-term prison sentence, he insists that he's innocent. With an eyewitness testimony and a fingerprint at the crime scene, how can he prove his case? Series Information Teachers and students can choose from five high-interest topical strands that are based in science, history and social studies. Designed to engage and motivate reluctant and enthusiastic readers alike, Xbooks will help students unlock the power and pleasure of reading.